<template lang="html">
  <div class="index">
    <div id="hovertreecontainer">
<div>
<h1 id="h1">Kai欢迎您 </h1>
<p> </p>
<h2 id="h2"> 欢迎来到我的Blog</h2>
<p><strong><router-link to="/blog">进入主站</router-link></strong></p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
</div>

</div>
<canvas id="canvas"></canvas>
  </div>
</template>

<script>

; (function (window) {
const Stats = function () { var e = Date.now(), t = e, i = 0, n = 1 / 0, r = 0, s = 0, o = 1 / 0, a = 0, l = 0, h = 0, c = document.createElement("div"); c.id = "stats", c.addEventListener("mousedown", function (e) { e.preventDefault(), v(++h % 2) }, !1), c.style.cssText = "width:80px;opacity:0.9;cursor:pointer"; var u = document.createElement("div"); u.id = "fps", u.style.cssText = "padding:0 0 3px 3px;text-align:left;background-color:#002", c.appendChild(u); var d = document.createElement("div"); d.id = "fpsText", d.style.cssText = "color:#0ff;font-family:Helvetica,Arial,sans-serif;font-size:9px;font-weight:bold;line-height:15px", d.innerHTML = "FPS", u.appendChild(d); var p = document.createElement("div"); for (p.id = "fpsGraph", p.style.cssText = "position:relative;width:74px;height:30px;background-color:#0ff", u.appendChild(p); 74 > p.children.length;) { var f = document.createElement("span"); f.style.cssText = "width:1px;height:30px;float:left;background-color:#113", p.appendChild(f) } var m = document.createElement("div"); m.id = "ms", m.style.cssText = "padding:0 0 3px 3px;text-align:left;background-color:#020;display:none", c.appendChild(m); var g = document.createElement("div"); g.id = "msText", g.style.cssText = "color:#0f0;font-family:Helvetica,Arial,sans-serif;font-size:9px;font-weight:bold;line-height:15px", g.innerHTML = "MS", m.appendChild(g); var y = document.createElement("div"); for (y.id = "msGraph", y.style.cssText = "position:relative;width:74px;height:30px;background-color:#0f0", m.appendChild(y); 74 > y.children.length;) { var f = document.createElement("span"); f.style.cssText = "width:1px;height:30px;float:left;background-color:#131", y.appendChild(f) } var v = function (e) { switch (h = e) { case 0: u.style.display = "block", m.style.display = "none"; break; case 1: u.style.display = "none", m.style.display = "block" } }, b = function (e, t) { var i = e.appendChild(e.firstChild); i.style.height = t + "px" }; return { REVISION: 11, domElement: c, setMode: v, begin: function () { e = Date.now() }, end: function () { var h = Date.now(); return i = h - e, n = Math.min(n, i), r = Math.max(r, i), g.textContent = i + " MS (" + n + "-" + r + ")", b(y, Math.min(30, 30 - 30 * (i / 200))), l++, h > t + 1e3 && (s = Math.round(1e3 * l / (h - t)), o = Math.min(o, s), a = Math.max(a, s), d.textContent = s + " FPS (" + o + "-" + a + ")", b(p, Math.min(30, 30 - 30 * (s / 100))), t = h, l = 0), h }, update: function () { e = this.end() } } };

var ctx,
hue,
logo,
form,
buffer,
target = {},
tendrils = [],
settings = {};

settings.debug = true;
settings.friction = 0.5;
settings.trails = 20;
settings.size = 50;
settings.dampening = 0.25;
settings.tension = 0.98;

Math.TWO_PI = Math.PI * 2;


function Oscillator(options) {
this.init(options || {});
}

Oscillator.prototype = (function () {

var value = 0;

return {

init: function (options) {
this.phase = options.phase || 0;
this.offset = options.offset || 0;
this.frequency = options.frequency || 0.001;
this.amplitude = options.amplitude || 1;
},

update: function () {
this.phase += this.frequency;
value = this.offset + Math.sin(this.phase) * this.amplitude;
return value;
},

value: function () {
return value;
}
};

})();

function Tendril(options) {
this.init(options || {});
}

Tendril.prototype = (function () {

function Node() {
this.x = 0;
this.y = 0;
this.vy = 0;
this.vx = 0;
}

return {

init: function (options) {

this.spring = options.spring + (Math.random() * 0.1) - 0.05;
this.friction = settings.friction + (Math.random() * 0.01) - 0.005;
this.nodes = [];

for (var i = 0, node; i < settings.size; i++) {

node = new Node();
node.x = target.x;
node.y = target.y;

this.nodes.push(node);
}
},

update: function () {

var spring = this.spring,
node = this.nodes[0];

node.vx += (target.x - node.x) * spring;
node.vy += (target.y - node.y) * spring;

for (var prev, i = 0, n = this.nodes.length; i < n; i++) {

node = this.nodes[i];

if (i > 0) {

prev = this.nodes[i - 1];

node.vx += (prev.x - node.x) * spring;
node.vy += (prev.y - node.y) * spring;
node.vx += prev.vx * settings.dampening;
node.vy += prev.vy * settings.dampening;
}

node.vx *= this.friction;
node.vy *= this.friction;
node.x += node.vx;
node.y += node.vy;

spring *= settings.tension;
}
},

draw: function () {

var x = this.nodes[0].x,
y = this.nodes[0].y,
a, b;

ctx.beginPath();
ctx.moveTo(x, y);

for (var i = 1, n = this.nodes.length - 2; i < n; i++) {

a = this.nodes[i];
b = this.nodes[i + 1];
x = (a.x + b.x) * 0.5;
y = (a.y + b.y) * 0.5;

ctx.quadraticCurveTo(a.x, a.y, x, y);
}

a = this.nodes[i];
b = this.nodes[i + 1];

ctx.quadraticCurveTo(a.x, a.y, b.x, b.y);
ctx.stroke();
ctx.closePath();
}
};

})();


function init(event) {

document.removeEventListener('mousemove', init);
document.removeEventListener('touchstart', init);

document.addEventListener('mousemove', mousemove);
document.addEventListener('touchmove', mousemove);
document.addEventListener('touchstart', touchstart);

mousemove(event);
reset();
loop();
}

function reset() {

tendrils = [];

for (var i = 0; i < settings.trails; i++) {

tendrils.push(new Tendril({
spring: 0.45 + 0.025 * (i / settings.trails)
}));
}
}

function loop() {

if (!ctx.running) return;

ctx.globalCompositeOperation = 'source-over';
ctx.fillStyle = 'rgba(8,5,16,0.4)';
ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
ctx.globalCompositeOperation = 'lighter';
ctx.strokeStyle = 'hsla(' + Math.round(hue.update()) + ',90%,50%,0.25)';
ctx.lineWidth = 1;

if (ctx.frame % 60 == 0) {
console.log(hue.update(), Math.round(hue.update()), hue.phase, hue.offset, hue.frequency, hue.amplitude);
}

for (var i = 0, tendril; i < settings.trails; i++) {
tendril = tendrils[i];
tendril.update();
tendril.draw();
}

ctx.frame++;
ctx.stats.update();
requestAnimFrame(loop);
}

function resize() {
ctx.canvas.width = window.innerWidth;
ctx.canvas.height = window.innerHeight;
}

function start() {
if (!ctx.running) {
ctx.running = true;
loop();
}
}

function stop() {
ctx.running = false;
}

function mousemove(event) {
if (event.touches) {
target.x = event.touches[0].pageX;
target.y = event.touches[0].pageY;
}else {
target.x = event.clientX
target.y = event.clientY;
}
event.preventDefault();
}

function touchstart(event) {
if (event.touches.length == 1) {
target.x = event.touches[0].pageX;
target.y = event.touches[0].pageY;
}
}

function keyup(event) {

switch (event.keyCode) {
case 32:
save();
break;
default:

}
}

function letters(id) {

var el = document.getElementById(id),
letters = el.innerHTML.replace('&', '&').split(''),
heading = '';

for (var i = 0, n = letters.length, letter; i < n; i++) {
letter = letters[i].replace('&', '&amp');
heading += letter.trim() ? '<span class="letter-' + i + '">' + letter + '</span>' : ' ';
}

el.innerHTML = heading;
setTimeout(function () {
el.className = 'transition-in';
}, (Math.random() * 500) + 500);
}

function save() {

if (!buffer) {

buffer = document.createElement('canvas');
buffer.width = screen.availWidth;
buffer.height = screen.availHeight;
buffer.ctx = buffer.getContext('2d');

form = document.createElement('form');
form.method = 'post';
form.input = document.createElement('input');
form.input.type = 'hidden';
form.input.name = 'data';
form.appendChild(form.input);

document.body.appendChild(form);
}

buffer.ctx.fillStyle = 'rgba(8,5,16)';
buffer.ctx.fillRect(0, 0, buffer.width, buffer.height);

buffer.ctx.drawImage(canvas,
Math.round(buffer.width / 2 - canvas.width / 2),
Math.round(buffer.height / 2 - canvas.height / 2)
);

buffer.ctx.drawImage(logo,
Math.round(buffer.width / 2 - logo.width / 4),
Math.round(buffer.height / 2 - logo.height / 4),
logo.width / 2,
logo.height / 2
);

window.open(buffer.toDataURL(), 'wallpaper', 'top=0,left=0,width=' + buffer.width + ',height=' + buffer.height);


}

window.requestAnimFrame = (function () {
return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || function (fn) { window.setTimeout(fn, 1000 / 60) };
})();

window.onload = function () {

ctx = document.getElementById('canvas').getContext('2d');
ctx.stats = new Stats();
ctx.running = true;
ctx.frame = 1;

logo = new Image();
logo.src = 'ht' + 'tp://ho' + 'vertree.c' + 'om/themes/hvtimages/hvtlogo.p' + 'ng';

hue = new Oscillator({
phase: Math.random() * Math.TWO_PI,
amplitude: 85,
frequency: 0.0015,
offset: 285
});

letters('h1');
letters('h2');

document.addEventListener('mousemove', init);
document.addEventListener('touchstart', init);
document.body.addEventListener('orientationchange', resize);
window.addEventListener('resize', resize);
window.addEventListener('keyup', keyup);
window.addEventListener('focus', start);
window.addEventListener('blur', stop);

resize();

if (window.DEBUG) {

var gui = new dat.GUI();

// gui.add(settings, 'debug');
settings.gui.add(settings, 'trails', 1, 30).onChange(reset);
settings.gui.add(settings, 'size', 25, 75).onFinishChange(reset);
settings.gui.add(settings, 'friction', 0.45, 0.55).onFinishChange(reset);
settings.gui.add(settings, 'dampening', 0.01, 0.4).onFinishChange(reset);
settings.gui.add(settings, 'tension', 0.95, 0.999).onFinishChange(reset);

document.body.appendChild(ctx.stats.domElement);
}
};

})(window);
</script>
<style lang="scss" scoped>
.index{
    margin: 0;
    padding: 0;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    -ms-box-sizing: border-box;
    -o-box-sizing: border-box;
    box-sizing: border-box;
     margin: 0;
    padding: 0;
    font: 16px/1.4 'Lato', sans-serif;
    color: #fefeff;
    -webkit-font-smoothing: antialiased;
    font-smoothing: antialiased;
    background: rgb(8,5,16);
    overflow: hidden;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    width: 100%;
    height: 100%;




h1 {
    font: 2.75em 'Cinzel', serif;
    font-weight: 400;
    letter-spacing: 0.35em;
    text-shadow: 0 0 25px rgba(254,254,255,0.85);
}

h2 {
    font: 1.45em 'Cinzel', serif;
    font-weight: 400;
    letter-spacing: 0.5em;
    text-shadow: 0 0 25px rgba(254,254,255,0.85);
    text-transform: lowercase;
}

[class^="letter"] {
    -webkit-transition: opacity 3s ease;
    -moz-transition: opacity 3s ease;
    transition: opacity 3s ease;
}

.letter-0 {
    transition-delay: 0.2s;
}

.letter-1 {
    transition-delay: 0.4s;
}

.letter-2 {
    transition-delay: 0.6s;
}

.letter-3 {
    transition-delay: 0.8s;
}

.letter-4 {
    transition-delay: 1.0s;
}

.letter-5 {
    transition-delay: 1.2s;
}

.letter-6 {
    transition-delay: 1.4s;
}

.letter-7 {
    transition-delay: 1.6s;
}

.letter-8 {
    transition-delay: 1.8s;
}

.letter-9 {
    transition-delay: 2.0s;
}

.letter-10 {
    transition-delay: 2.2s;
}

.letter-11 {
    transition-delay: 2.4s;
}

.letter-12 {
    transition-delay: 2.6s;
}

.letter-13 {
    transition-delay: 2.8s;
}

.letter-14 {
    transition-delay: 3.0s;
}

h1, h2 {
    visibility: hidden;
    -webkit-transform: translate3d(0, 0, 0);
    -moz-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
}

    h1.transition-in,
    h2.transition-in {
        visibility: visible;
    }

    h1 [class^="letter"],
    h2 [class^="letter"] {
        opacity: 0;
    }

    h1.transition-in [class^="letter"],
    h2.transition-in [class^="letter"] {
        opacity: 1;
    }

#hovertreecontainer {
    display: table;
    position: absolute;
    z-index: 20;
    width: 100%;
    height: 100%;
    text-align: center;
    cursor: none;
    left: 15px;
}

    #hovertreecontainer > div {
        display: table-cell;
        vertical-align: middle;
    }

    #hovertreecontainer p {
        position: absolute;
        width: 100%;
        left: 0;
        bottom: 25px;
        font-size: 0.8em;
        letter-spacing: 0.1em;
        font-weight: 300;
        color: #76747a;
        -webkit-font-smoothing: subpixel-antialiased;
        font-smoothing: subpixel-antialiased;
    }

        #hovertreecontainer p strong {
            color: #b3abc5;
            font-size: 5em;
        }

        #hovertreecontainer p span {
            font-size: 0.75em;
            padding: 0 2px;
        }

#canvas {
    position: absolute;
    z-index: 10;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    cursor: none;
}

#stats {
    position: absolute;
    z-index: 10;
    left: 10px;
    top: 10px;
}

.dg.ac {
    z-index: 100 !important;
}

#hovertreecontainer div p strong a {
    color: #999;
    font-size: 0.5em;
}

body, td, th {
    font-family: Lato, sans-serif;
}

a:link {
    text-decoration: none;
}

a:visited {
    text-decoration: none;
}

a:hover {
    text-decoration: none;
}

a:active {
    text-decoration: none;
}
}
</style>